diff --git a/tools/apigee-proxy-modifier-validator/requirements.txt b/tools/apigee-proxy-modifier-validator/requirements.txt
index e89994e1..1f1a94d8 100644
--- a/tools/apigee-proxy-modifier-validator/requirements.txt
+++ b/tools/apigee-proxy-modifier-validator/requirements.txt
@@ -4,7 +4,7 @@ charset-normalizer==3.4.2
 google-auth==2.40.0
 google-auth-httplib2==0.2.0
 httplib2==0.22.0
-idna==3.10
+idna==3.15
 lxml==6.1.0
 pyasn1==0.6.3
 pyasn1_modules==0.4.2